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• <br /> QUALITY CONTROL DATA PERTAINING TO SAMPLE LOG 2835 <br /> Accuracy and Precision, Soil : ` <br /> Analysis % Spike Recoveries* RPD** <br /> Benzene 100 ,100 0-% <br /> Toluene 100 ,91 9% <br /> Ethyl Benzene 100 ,91 9% <br /> Xylenes 107,90 17% <br /> TPH as Gasoline 110 , 100 10% <br /> TPH as Diesel 104 , 104 0% <br /> Blank, Soil: <br /> Analyses Measured Value <br /> Benzene <.005 mg/kg <br /> Toluene <. 005 mg/kg <br /> Ethylbenzene <.005 mg/kg <br /> • Xylenes <.005 mg/kg <br /> TPH as Gasoline <.5 mg/kg <br /> TPH as Diesel <10 mg/kg <br /> * 100 is the optimum value for a spike recovery. <br /> ** RPD is "Relative Percent Difference" , which is defined as <br /> the difference of two values divided by their mean, expressed <br /> as a percentage. <br /> Western Environmental <br /> Science 8 Technology <br /> 1046 Olive Drive Suite 3 <br /> Davis CA 95616 <br /> 915 753-9500 <br />